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Invalid proofs when proving in parallel. #23

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recmo opened this issue Mar 18, 2022 · 1 comment
Open

Invalid proofs when proving in parallel. #23

recmo opened this issue Mar 18, 2022 · 1 comment

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@recmo
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recmo commented Mar 18, 2022

The ProvingKey<Bn254>, ConstraintMatrices<Fr> are shared through constant reference. WitnessCalculator is cloned and passed as mutable reference.
@recmo
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recmo commented Mar 18, 2022 •
edited

Adding a Mutex around the WitnessCalculator solves it. So .clone() on it is not actually safe.

The clone call happens concurrently (because the types allow it). Forcing the clone to be sequential does not solve the issue. Forcing calculate_witness_element to be sequential does solve it. This despite the calls being on separated clones instances. So it appears that clone() creates unsafe shared state.

@recmo recmo mentioned this issue Mar 18, 2022
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